CuS + 4 HNO3 → Cu(NO3)2 + 2 NO2 + S + 2 H2O
1+4+1+2+1+2=11
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CuS + 4 HNO3 → Cu(NO3)2 + 2 NO2 + S + 2 H2O
1+4+1+2+1+2=11